﻿#region Copyright(c) 2006 ZO, All right reserved.
// -----------------------------------------------------------------------------
// Copyright(c) 2006 ZO, All right reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//   1.  Redistribution of source code must retain the above copyright notice,
//       this list of conditions and the following disclaimer.
//   2.  Redistribution in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//   3.  The name of the author may not be used to endorse or promote products
//       derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
// EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// -----------------------------------------------------------------------------
#endregion


#region Using directives

using System;
using System.Text;

#endregion

namespace ZO.SmartCore.Standards.StringPrep
{
    /// <summary>
    /// Default MapTable
    /// </summary>
    internal class DefaultMapTable : MappingTable
    {

        #region Constructors
        /// <summary>
        /// Initializes a new instance of the <see cref="DefaultMapTable"/> class.
        /// </summary>
        /// <param name="from">From.</param>
        /// <param name="to">To.</param>
        public DefaultMapTable(char[] from, string[] to) : base() { this.from = from; this.to = to; }


        #endregion

        #region Destructor

        #endregion

        #region Fields
        private char[] from;
        private string[] to;

        #endregion

        #region Events

        #endregion

        #region Operators

        #endregion

        #region Properties

        #endregion

        #region Methods
   
        /// <summary>
        /// Perform mapping for each character of input.
        /// </summary>
        /// <param name="text">The StringBuilder to map.</param>
        /// <returns></returns>
        public override void Map(StringBuilder text)
        {
            string replace;
            int pos;

            if ((text == null) || (text.Length == 0))
            {
                return;
            }

            StringBuilder result = new StringBuilder();

            for (int i = 0; i < text.Length; i++)
            {
                pos = Array.BinarySearch(from, text[i]);

                if (pos >= 0)
                {
                    if ((replace = to[pos]) != null)
                    {
                        result.Append(replace);
                    }
                }
                else
                {
                    result.Append(text[i]);
                } // else
            }

            text = result;
        }

        #endregion
    }
}
